4341007 scms/mod/ibis/vwiew.php?id College-SCC 202-Fall17 (Session l)-MERCIER Ac

Question

4341007 scms/mod/ibis/vwiew.php?id College-SCC 202-Fall17 (Session l)-MERCIER Activities and Due Dates HW 6-Chapter 17 /2017 11:55 PM66/10 -Print Calolatr Periodic Table on 25 of 27 Maj neral Chemistry 4th Edition University Science Books presented by Sapling Learming Phosphoric acid is a triprotic acid (K-6.9× 10-3. K2-62x 10-8, and Ka-48× 10-3). To find the pH of a buffer composed of H2PO4 (aq) and HPO the Henderson-Hasselbaich equation? (aq), which pk, value would you use in pKo 7.21 O pkas 12.32 Calculate the pH of a buffer solution obtained by dissoving 26.0 g of KH,POd(s) and 37.0 g of NagHPO.(s) in water and then diluting to 1.00 L Number

Explanation / Answer

Answer: pKa2=7.21

H2PO4 + H2O HPO42 + H3+O, pKa2=7.21

pH=pKa2 + log ([HPO42] /[H2PO4])

pH=7.21 + log ([HPO42] /[H2PO4])

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